* CBS CORP - NAI’S BYLAW AMENDMENTS CANNOT BECOME EFFECTIVE UNDER CONTROLLING FEDERAL LAW AND SEC RULES UNTIL 20 DAYS EVEN IF THEY WERE VALID

* CBS - IT BELIEVES DETERMINATION BY BOARD TO DECLARE A PRO RATA DIVIDEND, CONTINGENT ON DELAWARE COURT APPROVAL, WAS NOT SUBJECT TO NAI’S BYLAW AMENDMENTS Source text for Eikon: Further company coverage: